Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 54 for “"Canonical Correspondence Analysis"”.
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Correspondence Between Aquatic Ecoregions and the Distribution of Fish Communities of Eastern Oklahoma
… that support similar fish communities. Although correspondence was observed between fish assemblages and three montane ecoregions, the classification system must be refined and expanded to include major drainage basins and physical habitat attributes for some areas to adequately partition …
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SPATIO-TEMPORAL DYNAMICS OF BIOMES IN THE NORTHWESTERN UNITED STATES (9000 YBP TO THE PRESENT)
… and through the last 9,000 years. The modern analysis used canonical correspondence analysis (CCA) on pollen percentages from recent sediment cores reflecting modern vegetation assemblages and climates to evaluate the amount of influence of selected environmental variables on present species …
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SPATIO-TEMPORAL DYNAMICS OF BIOMES IN THE NORTHWESTERN UNITED STATES (9000 YBP TO THE PRESENT)
… and through the last 9,000 years. The modern analysis used canonical correspondence analysis (CCA) on pollen percentages from recent sediment cores reflecting modern vegetation assemblages and climates to evaluate the amount of influence of selected environmental variables on present species …
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Variability within the 10-year pollen rain of a seasonal neotropical forest
… from Barro Colorado Island (BCI), Panama. Using canonical correspondence analysis, we identified the environmental variables that most account for intra-annual and inter-annual variability in tropical pollen production and found that pollen rain samples effectively captured the strong seasonality …
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Land snail species diversity and composition between different forest disturbance regimes in central and eastern Kentucky Forests
… collected and analyzed using a random effects analysis of variance as well as non-metric multidimensional scaling to compare community structures. Habitat data was analyzed using canonical correspondence analysis. In the Inner Bluegrass Region, the snail diversity was high, and had low …
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Influence of Human Recreational Activities and Vegetative Characteristics on Waterbird Abundance
… multi-variate statistics. A Principle Component Analysis test was run to analyze the difference between the three a priori reaches of the river, divided by the amount of disturbance present, as well as variance partitioning, a test utilizing the Canonical Correspondence Analysis test. With only 2 …
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An Assessment of the Use of Seeding, Mowing, and Burning in the Restoration of an Oldfield to Tallgrass Prairie in Lewisville, Texas
… range test, both on ranked data. Community level analysis was conducted with both a MANOVA on ranked data and a Canonical Correspondence Analysis on raw data. Results indicate that seeding positively affected species richness, particularly when combined with either burning or mowing in the early …
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The Influence of Livestock grazing on Plant Species Diversity and Distribution at Kiranjeranje Ward-Kilwa District
… ward was studied using multivariate gradient analysis. Vegetation data were collected in 30 established plots using the stratified random sampling method. For each plot established environmental data on edaphic factors and anthropogenic disturbances were also collected. The plant species were …
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Zooplankton Species Composition and Diversity in Floodplain Ponds: Effects of Flooding and Local Site Characteristics
… and duration in a community ordination (Canonical Correspondence Analysis). This analysis revealed strong relationships between species occurrences and presence of fish, pond depth, and distance from the lake. Species occurrences were mildly constrained by total dissolved solids …
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Comparative analysis of aquatic insect, amphipod, and isopod community composition along environmental gradients in rheocrene spring systems of Missouri
… similarity coefficient and UPGMA cluster analysis showed that differences between high discharge spring systems may be related to the presence of trout and trout fisherman. Renkonen's similarity coefficient and UPGMA cluster analysis showed that differences between low to medium discharge …
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A study of the relationship between environmental conditions and salt marsh zonation at Langebaan Lagoon
… species and environmental data were subjected to canonical correspondence analysis, a powerful ordination technique in an attempt to unravel and illuminate the complex relationships in the species-environment.
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Using Benthic Indicator Species and Community Gradients to Optimize Restoration in the Arid, Endorheic Walker River Watershed, Western USA
… using a combination of indicator species analysis, cluster analysis, canonical correspondence analysis, and community tolerance indices to evaluate the variation of benthic macroinvertebrate community composition across a set of environmental gradients. Results demonstrate that benthic …
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Shallow subtidal seaweed communities of the Agulhas Marine Province of South Africa
… of this area were investigated using Detrended Correspondence Analysis, Canonical Correspondence Analysis and cluster analysis, in order to compare them with previous studies on the marine biogeography of the area. In the 85 quadrats that were sampled, 97 species of Chlorophyta, Phaeophyta and …
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Assemblage structure and shallow-water habitat use by small-bodied fishes at lower Missouri River sandbars
… and environmental factors were evaluated using Analysis of Variance, Detrended Correspondence Analysis, and Canonical Correspondence Analysis. Samples yielded 49 species from 13 families in depths 0.0-0.5 m; most fishes were [less than or equal to]105 mm TL. Fish mean length increased but …
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Influence of elevation on tree species distribution and growth in the southern Appalachian Mountains
… have long been an area of interest for the analysis of forest species growth and composition. Past forest vegetation studies focus on species composition and structure for relatively local scale research areas. Species distribution within this geographic area was compiled from studies …
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Impacts of Land-Use on Leaf Breakdown and Macroinvertebrate Assemblages in Southern Appalachian Streams
… negative relationship with conductivity. Canonical Correspondence Analysis (CCA) showed that agricultural streams were characterized by temperature and flow, forested streams by MPS and standing stock course particulate organic matter (SSCPOM), and two of three exurban streams by …
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Vegetation-environment relationships in a subalpine wet meadow and a brackish tidal marsh
… X 10 m). At each scale, minimum variance cluster analysis and canonical correlation analysis were used to describe community structure by selecting a dendrogram level to segregate the vegetation data into subcommunities. Vegetation data were correlated with environmental data using canonical …
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Nematofauna da planície de maré de Coroa Grande, Baía de Sepetiba, RJ
… composition, organic matter anel chlorophyll analysis were also collected. Canonical correspondence analysis (CCA) was used to evaluate the community structure. Two different classifications were used in order to determine the trophic structure. The structure of nematode community showed a …
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Bayesian Model Averaging and Variable Selection in Multivariate Ecological Models
… contrary to the practice of conventional data analysis (such as, for example, stepwise model selection). In addition, variable activation probabilities can be obtained for each variable of interest. This dissertation is aimed at connecting BMA and various ramifications of the multivari-ate …
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Groundfish species diversity and assemblage structure in Icelandic waters during a period of rapid warming (1996-2007)
… ár hvert. Klasagreining (hierarchical cluster analysis) var notuð til að skilgreina samfélög fiska á tveimur tímabilum og fjölþáttagreiningin CCA (canonical correspondence analysis) til að kanna tengsl milli samfélaga og hitastigs, dýpis, breiddar- og lengdargráðu og ára. Einnig voru notaðir …
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